Magneto-transport in a quantum network: Evidence of a mesoscopic switch

We investigate magneto-transport properties of a $\theta$ shaped three-arm mesoscopic ring where the upper and lower sub-rings are threaded by Aharonov-Bohm fluxes $\phi_1$ and $\phi_2$, respectively, within a non-interacting electron picture. A discrete lattice model is used to describe the quantum network in which two outer arms are subjected to binary alloy lattices while the middle arm contains identical atomic sites. It is observed that the presence of the middle arm provides localized states within the band of extended regions and lead to the possibility of switching action from a high conducting state to a low conducting one and vice versa. This behavior is justified by studying persistent current in the network. Both the total current and individual currents in three separate branches are computed by using second-quantized formalism and our idea can be utilized to study magnetic response in any complicated quantum network. The nature of localized eigenstates are also investigated from probability amplitudes at different sites of the quantum device.Comment: 7 pages, 9 figure

Magnetic Response in a Zigzag Carbon Nanotube

Magnetic response of interacting electrons in a zigzag carbon nanotube threaded by a magnetic flux is investigated within a Hartree-Fock mean field approach. Following the description of energy spectra for both non-interacting and interacting cases we analyze the behavior of persistent current in individual branches of a nanotube. Our present investigation leads to a possibility of getting a filling-dependent metal-insulator transition in a zigzag carbon nanotube.Comment: 9 pages, 14 figure

A single period inventory model of a deteriorating item sold from two shops with shortage via genetic algorithm

Inventory of differential units of a deteriorating item purchased in a lot and sold separately from two shops under a single management is considered. Here deterioration increases with time and demands are time- and price-dependent for fresh and deteriorated units respectively. For the fresh units, shortages are allowed and later partially-backlogged. For the deteriorated units, there are two scenarios depending upon whether initial rate of replenishment of deteriorated units is less or more than the demand of these items. Under each scenario, five sub-scenarios are depicted depending upon the time periods of the two-shops. For each sub scenarios, profit maximization problem has been formulated and solved for optimum order quantity and corresponding time period using genetic Algorithm (GA) with Roulette wheel selection, arithmetic crossover and uniform mutation and Generalized Reduced Gradient method (GRG). All sub-scenarios are illustrated numerically and results from two methods are compared.

CLINICAL AND HAEMATO-BIOCHEMICAL ALTERATIONS FOLLOWING TREATMENT WITH INTERFERENTIAL THERAPY IN THE BACK PAIN IN DOGS

A total of sixteen clinical cases, comprising of 8 animals each in Group I (animals with hindquarter weakness, which could stand, and had staggering gait and intact pain sensation) and Group II (animals with hind quarter paresis, which were unable to stand and dragged hind legs while walking with intact pain sensation) were treated with Computerized interferential unit and conventional therapy. Different clinical and haematobiochemical study revealed that the post treatment changes were transient and remains within normal physiological limits

Evaluation of 19 autoimmune disease-associated loci with rheumatoid arthritis in a Colombian population: Evidence for replication and gene-gene interaction

Objective. Recent studies have identified several common genes associated with multiple autoimmune diseases that support the hypothesis of the presence of shared or general autoimmunity genes. However, most of this work has been performed in populations of white origin. The main objectives of this study are to replicate the genotype-phenotype correlation between 19 such variants and rheumatoid arthritis (RA), and to evaluate gene-gene interactions between these genes in individuals from an ethnically homogenous nonwhite Colombian population. Methods. Nineteen single-nucleotide polymorphisms (SNP) from 16 genes/loci were genotyped in 353 RA cases and 368 controls. For each SNP, allelic and genotype-based association tests were applied to evaluate genotype-phenotype correlation. Permutation-based tests were used to validate the statistical significance. Gene-gene interactions were assessed by logistic regression. Results. We replicated the genetic association with rs13277113 (p = 0.0009, OR 1.46) and rs2736340 (p = 0.0001, OR 1.63) from C8orf13-BLK (8p23.1, associated with RA and systemic lupus erythematosus), and rs763361 (p = 0.03) from CD226 (18q22.3, associated with multiple sclerosis and type 1 diabetes) in the Colombian population. The population-attributable risks were estimated as 27%, 34%, and 16% for rs13277113, rs2736340, and rs763361, respectively. We also detected evidence for gene-gene interaction between SNP in MMEL1 (rs3890745) and C80rf13-BLK (rs13277113; p = 0.0002). Conclusion. Our results demonstrate that the IL2/IL21 region, C8orf13-BLK, and CD226 influence RA in Colombians, and RA shares some of the pathogenic mechanisms associated with other autoimmune diseases. The Journal of Rheumatology Copyright © 2011. All rights reserved

Broad Spectrum Anti-Bacterial Activity of a Recombinant Phosphatase-Like Protein (rPLP), Isolated from the Shrimp Penaeus monodon

Antimicrobial peptides play a significant role in the innate immune response of crustaceans. The gene coding for a phosphatase-like protein (PLP) from the black tiger shrimp, Penaeus monodon was cloned using pQE-30-UA expression vector and expressed in Escherichia coli M15 host cells. The recombinant protein purified by nickel-nitrilotriacetic acid affinity chromatography, gave a single distinct band of approximately 25 kDa by 15% sodium dodecyl sulfate polyacrylamide gel electrophoresis. The anti-bacterial activity of the recombinant phosphatase-like protein (rPLP) was characterized in vitro. Solid phase agar based assay revealed its inhibitory effect against several gram positive and gram negative bacteria. The minimal inhibitory concentration of the rPLP against Vibrio harveyi, by micro dilution method, was 1 μg/ml. This protein offers promise for use in hatcheries to control luminous vibriosis

A thermokinetic model for dropwise condensation on a planar substrate with conical pores

Within the framework of the classical theory of heterogeneous condensation, a thermokinetic model has been developed for dropwise condensation on a planar substrate with conical pits. The development or the dissolution of the nucleated droplet is accounted due to both interfacial and peripheral mass transfer and by considering various geometric configurations, i.e. formed droplet within the conical pore, at the pore edge, and outside the pore respectively. Along with the principle of exergy maximization, detailed-balance-based kinetic approach has been employed to investigate the influence of the pore size and the substrate wettability on the thermokinetics of droplet nucleation of water vapor. The available energy for droplet formation and the time rate of nucleation are obtained. The twice-nucleation phenomenon is supposed to take place for some particular pore sizes and its thermokinetic trait is different from that obtained from the classical condensation theory. For a given conicity, there is an appreciable amount of reduction in the free energy barrier with increase in the contact angle. The slant height of the conical pit is found to have a great influence in the condensation enhancement or suppression. The barrier reduces considerably when the slant height reduces. These outcomes indicate a physical insight into the context of surface engineering for the promotion or the hindrance of dropwise condensation on real or engineered surfaces.Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .International centre for heat and mass transfer.American society of thermal and fluids engineers

Evaluation of Regeneration of Shorea robusta Forests under Joint Forest Management in West Bengal, India

International audienc